Apparatus for manufacturing luster-free rayon



Feb.;15, 1938. Y. ASAKAWA APPARATUS FOR MANUFACTURING LUSTER FREE RAYON Filed March 25, 1936 INVENTORQ Patented Febh UNITED STATES seem-ms FOR ACTURING LUS- MANUF TEE-FREE BAYON Yukichi Aaakaws, Tokyo, Japan Application March 23, 198 6, Serial No. 70,480

8 Chlms.

vention, means are provided for changing the diameter of the extruded rayon thread regularly by "applying a. high frequency potential to the spinning nozzle for bending ortwisting the ex truded rayon forming solution. My invention will-he better understood from the Iellowlng description taken in connection with the accompanying drawing and its scope will he pointed out in the appended claims.

in the drawing, F155,. l is a. diagnostic verticai section of on epneretus tang my invention, Fig. 2 is a similar view of n modification which is further associated with moons iothend= ing or twistingthe extruded threed, end Fine. 3 to it illustrote in perspective and nlen views re spectively various forms oi the electrode to he msoeinted with the arrangement oi Fig. 2.

Helen-ring to l, numernl t represents n con= tether; 2 designates the rayon forming: solution such es nitrocellulose solution end 3 is n snnell m1 nozzle provided at the hottom oi the conteiner for extruding the solution '22. H desired, o. number of nozzles 3 may he provided in the contoiner l. According to my invention, the nonme 53 is made of an electric conductor end the container t is insulated from the former through the insulating member 5. The conductor ti is son-=- eiled with a. high frequency alternating. current voltage higher then Lotti volts and moving a ire quency hie'hei" than severnl thousnnd cycles. For m these purposes, the conductor portion is connected to e. high frequency source through c. high i feduehcy trensiormert. The source includes at moin osciiiotor volve ii and on eunilicry high irec uency oscillator l which is connected to. excite the grid oi the main valve 8.

Thus, the rayon forming solution 2 will he suhiected to e. high alternating current voltage hemins e, frequency higher then will) cycles when it is extruded from the nozzle 3. Thus the pen"- 5@ ticles constituting the solution are churned to he repelled from each other end the kinetic viscosity of the reyon forming solution is decreased. Accordingly the extruding velocity of the solution is not only increased, but also since the particles of the extruded thread are charged u ith,

electric charge of opposite polarity in succession upon extrusion, the extruding velocity is not uniform so that the surface of the thread 6 may be finely corrugated as shown in the drawing, and the unpleasant glaring luster of the thread is practically ohvioted.

Fig. 2B v illustrates a. modification of the apparatus in which one or more external electrodes are further associated with the arrangement of Fig. i for bending or twisting the thread. In the modification, the external electrodes to of any desired to are arranged along the thread ii in the zone in which the thread 5 is not yet com.- nletely solidified. The external electrodes ill ere supplied with an alternating durrent voltage through c. transformer M from {in alternating current source it. with this arrangement-veriohle torsion or bending may be elven to the thread by suitably selecting the phase. the ire= uuency or the polority of the applied voltage from sources end it. Thus, according to my process, the roycn tog solution l is cliorged with a certain potty from the source 8 ot the outlet oi the not i and keeps the charge otter it is extruded. Accordingly, it the cxternsl electrode it has on opposite polarity, the semi-solid thread will be attracted towerds the electrode it and the thread is out under teen to nccelerete the extrusion of the liquid it from the not i. S teneously. the thread is bent cs shown in the drawing with the result of ohviotint; desirable luster.

my desired electrode as shown in Figs. 3 to 5 mcy he edonted es the externel electrode it of his. 2. ll ows an electrode it of a. hell ring form which moy he used for bending the thread so shown in Fig. 2. Fig. 4.- shows an electrode i i of o ring form. With the electrode it, the bending is not given to the threod, but the thread may he corrugated.

in 5, the ring-electrode it is divided into three conducting segments by means of the insulctlng snocers it and the segments are respectively connected to the terminals of a three phase trons-former ll.

With this errengement, a. rotnting electric field is produced within the ring electrode it so that the porticles constituting the threod are subjected to arcvolvins force. The thread is twisted end the luster is obviated more positively.

I do not desire my invention to be limited to the embodiments shown and I intend in the appended claims to cover the medications within the spirit and scope of my invention.

What I claim as new and desire to secure by Letters Patent 0! the United States, is

1. Apparatus for manufacturing luster-free rayon comprising, a spinning nozzle, means for supplying the rayon forming solution to said nozzle, a high frequency alternating current voltage source, and means for applying a high frequency alternating current voltage to said nozzle irom said source. v

2. Apparatus for manufacturing luster-free rayon comprising, a spinning nozzle, means 101' supplying the rayon forming solution to said nozzle, means for applying a high frequency alternating current voltage to said nozzle, and external electrodes arranged along the extruded solution, said electrodes being supplied. with electric potentials in order to influence the charged extruded solution.

v 3. Apparatus for manufacturing luster-tree rayon comprising, a spinning nozzle, means for supplying the rayon forming solution to said nozzle, means for applying a high frequency alternating current voltage to said nozzle, external ring electrodes arranged along the extruded solution, each of said electrodes being divided into a plurality of segments which are respectively connected to the terminals of a polyphase electrical souree having a. number oiphases equal to the number of said segments in order to produce a rotating electrical field, whereoy the charged extruded solution passing through said ring electrodes is twisted.

YUKICHI ASAKAWA. 

